<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
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    <title>Document</title>
    <style>
        .div {
            width: 50px;
            height: 50px;
            background-color: #000;
            transform: rotateX(45deg) rotateZ(45deg);
            transform-style: preserve-3d;
        }
    </style>
</head>

<body>
    <div class="div">

    </div>
</body>
</html>